2. Add both types of onions, parsley, corn, lemon juice and zest, salt, and pepper, then mix.
3. Add the mayonnaise and mix.
For assembly:
1. Spread the tuna salad in the center of the tortilla and add the lettuce, breaking it up a bit so the tortilla doesn't tear.
2. Fold the edges inwards and roll into a wrap.
3. Trim the ends and cut into small rolls, or cut vertically in half and serve with arugula on the plate or leftover lettuce leaves cut into thin strips.
